open access

Vol 70, No 2 (2011)
ORIGINAL ARTICLES
Published online: 2011-06-01
Submitted: 2012-06-27
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Median aperture of the fourth ventricle revisited

M. Ciołkowski, M. Sharifi, S. Tarka, B. Ciszek
Folia Morphol 2011;70(2):84-90.

open access

Vol 70, No 2 (2011)
ORIGINAL ARTICLES
Published online: 2011-06-01
Submitted: 2012-06-27

Abstract

Background: The median aperture of Magendie is the largest of three openings of the fourth ventricle and thus it forms the main path for the outflow of the cerebrospinal fluid from the ventricle. The Magendie aperture connects the fourth ventricle with the cisterna magna and makes a natural corridor for neurosurgical approach and inspection of the ventricle and its floor. The purpose of this study was to give a contemporary anatomical view of this structure in the context of historical data.
Material and methods: The Magendie foramen was studied in 30 fixed specimens of human brainstems with cerebella. The microdissection technique was used. Measurements were taken with a microscope ocular ruler.
Results: The aperture is limited by the following structures: obex and gracile tubercles inferiorly, and tela choroidea with choroid plexus superolaterally. Obex tubercles usually have the form of a piece of neural tissue bridging two halves of the brainstem above the entrance to the central canal. Gracile tubercles together are 8.15 mm wide and the maximal width of the foramen is 6.53 mm. Tela choroidea attaches laterally at both sides to the inferior medullary velum. In most cases the right and left choroid plexus are connected to each other with a triangular membrane of tela choroidea, which protrudes through the median foramen and attaches to the vermis at a highly variable level.
Conclusions: We hope that the presented description of anatomical relations around the Magendie aperture, with its new measurements, will be helpful for those operating in the area and will explain some of the inaccuracies found in literature. (Folia Morphol 2011; 70, 2: 84–90)

Abstract

Background: The median aperture of Magendie is the largest of three openings of the fourth ventricle and thus it forms the main path for the outflow of the cerebrospinal fluid from the ventricle. The Magendie aperture connects the fourth ventricle with the cisterna magna and makes a natural corridor for neurosurgical approach and inspection of the ventricle and its floor. The purpose of this study was to give a contemporary anatomical view of this structure in the context of historical data.
Material and methods: The Magendie foramen was studied in 30 fixed specimens of human brainstems with cerebella. The microdissection technique was used. Measurements were taken with a microscope ocular ruler.
Results: The aperture is limited by the following structures: obex and gracile tubercles inferiorly, and tela choroidea with choroid plexus superolaterally. Obex tubercles usually have the form of a piece of neural tissue bridging two halves of the brainstem above the entrance to the central canal. Gracile tubercles together are 8.15 mm wide and the maximal width of the foramen is 6.53 mm. Tela choroidea attaches laterally at both sides to the inferior medullary velum. In most cases the right and left choroid plexus are connected to each other with a triangular membrane of tela choroidea, which protrudes through the median foramen and attaches to the vermis at a highly variable level.
Conclusions: We hope that the presented description of anatomical relations around the Magendie aperture, with its new measurements, will be helpful for those operating in the area and will explain some of the inaccuracies found in literature. (Folia Morphol 2011; 70, 2: 84–90)
Get Citation

Keywords

anatomy; choroid plexus; cisterna magna; foramen of Magendie; neurosurgical approach

About this article
Title

Median aperture of the fourth ventricle revisited

Journal

Folia Morphologica

Issue

Vol 70, No 2 (2011)

Pages

84-90

Published online

2011-06-01

Bibliographic record

Folia Morphol 2011;70(2):84-90.

Keywords

anatomy
choroid plexus
cisterna magna
foramen of Magendie
neurosurgical approach

Authors

M. Ciołkowski
M. Sharifi
S. Tarka
B. Ciszek

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